package com.daigoudao.system;

import java.util.Random;

import org.patchca.word.RandomWordFactory;

/**
 * 用于产生随即验证码
 * @author yangfeng
 *
 */
public class DGDRandomWordFactory extends RandomWordFactory {
	
	protected String wideCharacters;

	public void setWideCharacters(String wideCharacters) {
		this.wideCharacters = wideCharacters;
	}

	public DGDRandomWordFactory() {
		characters = "ABcdEeFfGHhJKkiLMmNnpQqRrSsTtUuVvWwXxYyZ2345678";
		wideCharacters = "Mm";
	}
	
	@Override
	public String getNextWord() {
		Random rnd = new Random();
		StringBuilder sb = new StringBuilder();
		StringBuilder chars = new StringBuilder(characters);
		int l = minLength + (maxLength > minLength ? rnd.nextInt(maxLength - minLength) : 0);
		for (int i = 0; i < l; i++) {
			int j = rnd.nextInt(chars.length());
			char c = chars.charAt(j);
			if (wideCharacters.indexOf(c) != -1) {
				for (int k = 0; k < wideCharacters.length(); k++) {
					int idx = chars.indexOf(String.valueOf(wideCharacters.charAt(k)));
					if (idx != -1) {
						chars.deleteCharAt(idx);
					}
				}
			}
			sb.append(c);
		}
		return sb.toString();
	}

}

